21
Fig. 35 —
Single Enthalpy Curve Boundaries
Table 10 —
Single Enthalpy and Dual Enthalpy High Limit Curves
Enthalpy Control Sensor Configuration
The optional enthalpy control sensor (Part Number: HH57AC081)
communicates with the W7220 economizer controller on the
2-wire communications bus and can either be wired using a 2-pin
header or using a side connector. The HH57AC081 sensor can be
used as a single outside air enthalpy, a differential return enthalpy,
or a differential return temperature sensor depending on the
dipswitch setting.
Use Fig. 36 and Table 11 to locate the wiring terminals for each
enthalpy control sensor.
Fig. 36 —
HH57AC081 Sensor
(Used as OA Enthalpy, Return Air Dry Bulb, or Return
Air Enthalpy)
Table 11 —
HH57AC081 Sensor Wiring Terminations
Use Fig. 36 and Table 12 to set the DIP switches for the desired
use of the sensor.
Table 12 —
HH57AC081 Sensor DIP Switch
If using differential (return) enthalpy or temperature option, see
Table 9 for California Title 24 setting requirements by region.
ENTHALPY
CURVE
TEMP. DRY
BULB (°F)
TEMP.
DEWPOINT (°F)
ENTHALPY
(btu/lb/da)
POINT P1
POINT P2
TEMP. (°F)
HUMIDITY
(%RH)
TEMP. (°F)
HUMIDITY
(%RH)
ES1
80
60
28.0
80
36.8
66.3
80.1
ES2
75
57
26.0
75
39.6
63.3
80.0
ES3
70
54
24.0
70
42.3
59.7
81.4
ES4
65
51
22.0
65
44.8
55.7
84.2
ES5
60
48
20.0
60
46.9
51.3
88.5
HL
86
66
32.4
86
38.9
72.4
80.3
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ENTHALPY
RA
HUM (%RH)
RA
TEMP
TEMPERATURE
ABSOLUTE HUMIDITY
ES5
ES4
ES3
ES2
ES1
HL
P1
(T,RH)
P2 (T,RH)
SINGLE ENTHALPY
DUAL ENTHALPY
HIGH LIMIT
DA
RA
OA
12
3
S-Bus
Temp & Humidity
HH57AC081
51/64 (21)
4-1/4 (108)
2-3/4 (70)
2-1/64 (55)
S-Bus
NOTE: Dimensions are in inches (mm)
TERMINAL
TYPE
DESCRIPTION
NUMBER
LABEL
1
S-BUS
S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
2
S-BUS
S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
USE
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
1
2
3
DA
OFF
ON
OFF
RA
ON
OFF
OFF
OA
OFF
OFF
OFF
